Detection of biological films observed by PALSAR ScanSAR mode and Fine mode under the different winds

Abstract

The archipelagoes in Philippine were selected to discuss a possibility to detect biological films by the Synthetic Aperture Radar (SAR). The ScanSAR Mode and the Fine mode of the ALOS PALSAR data were applied to represent the sea surface roughness. The distributions of chlorophyll-a concentration observed by the MODIS were used to discuss a contribution of biological films. The reanalysis wind data from the National Centers for Environmental Prediction (NCEP) were applied to distinguish wind fields of observation site. The Fast Fourier Transform (FFT) was applied to the surface roughness image observed by SAR to identify a directional component of wind wave and a power distribution in the frequency domain. A detection matrix of the biological films was created from the power spectrum distribution, chlorophyll-a, wind data, and discussed for the detection of biological films. From the interaction among chlorophyll-a concentration, surface winds, and sea surface roughness, the fine SAR image was more sensitive than the ScanSAR image for the detection of biological films.